i've not read the first one supa but as best i can tell, the second and third are basically the same with some additional material and some slightly altered. i think much of the content from the first has survived unedited in the third. what i've read so far has been very good. although i've not got very far through the advanced section, and some of the stuff i've read in it so far seems somewhat irrelevant against a lot of players at small stakes and especially microstakes. but if you're able to pick and choose which aspects you think would be applicable to your games and take the rest with a grain of salt, at least for the time being, then i'd say it's a good investment.